Growth, homeostatic regulation and stem cell dynamics in tissues

Area of Science:

• Biophysics
• Developmental Biology
• Mathematical Biology

Background:

• Tissue homeostasis relies on precise control of diverse cell populations, a mechanism not fully understood.
• Epithelial tissues exhibit complex cell interconversions crucial for development and disease.

Purpose of the Study:

• To develop a theoretical framework for epithelial tissue homeostasis.
• To investigate the role of mechanical stress in regulating cell division and tissue growth.
• To model stem cell dynamics and tissue morphogenesis.

Main Methods:

• Utilized mechanical equations to model tissue size.
• Employed kinetic equations to describe cell population interconversions.
• Developed a pressure-controlled growth model based on mechanical stresses.

Main Results:

• The generic model explains stem cell fraction evolution during intestinal development.
• The model accurately predicts intestinal wall shape and proliferative compartment expansion in cancer.
• Pressure-controlled growth elucidates stem cell compartment formation and cancerous colonic crypt morphologies.

Conclusions:

• Mechanical equations and kinetic modeling provide a robust framework for understanding tissue homeostasis.
• Mechanical stress-regulated cell division is a key factor in tissue development, cancer initiation, and wound healing.
• The proposed models offer insights into optimal wound healing strategies and disease morphologies.